Instrument for recording percentage volumes of constituent gases.



w. w. CROSWELLER. INSTRUMENT FOR RECORDING PERCENTAGE VOLUMES 0FGONSTITUENT GASES.

APPLICATION FILED MAR. 27.1916- Patented June 12, 1917.

JIIVIII IX X XIXH 171 venTor charge To all whom it may concern: I j

Be it known that '1, Warren ii. a Cues M 1 a subject of the King of GBritain and Ireland, residing at Mapledene, Kearsley Road, Grumpsall,Manchester, in the county of Lancaster, En land, sneer, have inventednew and usefu Improvements in Instruments for Recording Percenta Volumesof Constituent Gases, of which the following is a specification.

The invention relates to an improved instrument for use in recordingpercentage voles of constituent gases, which instru ment is articularlyapplicable as a carbon di-oxid 60 recorder. My object has been to designa simplifiedand efiective instru ment with a minimum of component parts,

as compared with known instruments for this purpose, reducing the costof manufacture and maintenance, and minimizing the liability to get outof order. An instrument made in accordance with my invention pos-'sesses a power vessel operated by water head, and a gas 'burette, soarranged. in relation to the power vessel and a siphon used'for drainingcit water from the power vessel that the gas burette will always hold aquantit of water which will become with any gas which is soluble inwater. The power vessel is in direct communication with the gas burette,without intervening air lock, or any controlling means or mechanism,governing such communication. Also in my improved instrument the exactadjusting of the volume of gas to be measured and the ultimate drainageof this gas sample, is effected by the medium of a single tube sealeddirectly by the rising of the water in the power vessel. These featuresnecessitate the employment of only three vessels, viz. the power vessel,the gas burette, and the absorption vessel, apart from a float vesseland float and the usual pen gear, clockwork drum and recording chart. a

T will describe now more particularly, referring to the accompanyingdrawing, the construction of my improved instrument as it would be madefor a C recorder.

An inlet ipe a for the flue gases, having a suitable lter b on anyconvenient part thereof, dips into a gas burette c, which burette isformed with a contracted waist at c at aboutthe end of the pipe a, andbelow theend of this pipe, is made of comparatively large dimensions tocontain a volno nncoo rnncnnreen vor.

1: a LIAM CBOSWELLER, OF'CRUTMSALL, MANGHES'E', ENGL.

. lime of water somewhat greater than the volume of the gas sample. Thefilter vessel 6 is filled with glass wool, cotton wool, or the like andthe outer gas sampling pipe connected to the inlet pipea is or may beprovided with a suitable filter. The outer gas sampling pipe will beconnected to the pipe a by means of a T piece partly indicated at a. A;branch d connects the lower end oi the gas burette 0 directly to thebottom of a power vessel 6, the bottom of the latter vessel beingtapered at e to connect with such branch. The power vessel is providedwith a siphon f to drain 0d a definite quantity of the water, when thewater reaches a certain level in the vessel. An absorption vessel g,containing a solution of caustic potash (sp. gr. about 1.27) is incommunication with the top of the gas burette specification of LettersPatent. Patented June 12, 193% Application filed Harlan 2?, 1am. vSerial No. 8819M.

as shown.- The absorption vessel 9' also communicates by means of a tube9*, open at the top, with the interior of a cylindrical float itcontained in a suitable float vessel 2 and sealed in pure paraffin (sp.gr. about 0.86) or any other suitable liquid the float h'being guided towork vertically upon a fixed spindle h. 'The float h isguided upon ahead if on the end of the spindle h by means of a tube It secured to thehead of the float h. Within the tube k is a shorter sleeve 71. limitingthe fall of the float h, the

end of the sleeve coming into contact with the head if. This is shown insection in the drawing the float being indicated in its lowest position.The tube gr connecting the absorption vessel 9 and float h is providedwith a branch 9 dipping into the power vessel 6, this branchserving todrain ofl the gas sample after the test has been made and recorded. Thisbranch pipe 9 may be made adjustable to regulate the level of the outletof such pipe in the power vessel. Above the float is one end of apivoted loaded lever j, the other end of such lever carrying theordinary pen markingdevice it working in conjunction with a chart on aclockwork actuated drum m of the usual description. In the lowestposition of the float h the lever j is in position shown by the dottedcenter line, the correct position of the pivoted lever being determinedby an adjustable stop j, the load 7' bein adjusted to press the end ofthe lever light y against the stop.

The pen nib k is then adjusted on the rod.

I tion the pen has been traversed downward to its dull extent across thechart on the drum and points to the bottom or zero line on the chart.

The action of the recorder is as follows:

The power vessel e and gas burette 0 contain when the apparatus is notat work a definite quantity of water at equal level, as shown in thedrawing, such level being below the discharge orifices of the gas inletpipe 0 in the burette and the gas outlet pipe g in the power vesselwhich charge of water in the gas burette at least becomes saturated,

during'the working of the apparatus, with.

CO and which charge of saturated water, contained always in the gasburette, 1s a novel and important feature of my lnvention.

Water from any suitable source is dis-' charged in a fine streamthrough'the pipe n into the power vessel 0 raising the level in it andalso in the burette until the orifices of the gas inlet pipe at in theburette and the gas outlet pipe 9 in the power vessel are immersed inthe water. When the water reaches a certain level the siphon f comesinto action to drain oil the water admitted, via the drain pipe f, at amuch greater rate than the rate of flow into the power vessel and theWater in the burette 0 and power vessel e falls to its normal level,which level is below the end of the gas inlet pipe a and thus a sampleor charge of the flue gas is inspired into the upper part of the gasburette. On the Water again rising in the burette and power vessel theorifices of the gas inlet pipe a and the gas outlet pipe 9 in the powervessel are closed by the rising water and the flue gas sample is forcedinto the absorbing solution in the absorption vessel g, the carbondi-oxid in the gas being absorbed by the caustic potash therein. Therest of the sample is forced out of the absorption vessel 9 into thehollow float It being discharged against the underside of the head ofthe float, above the level of the araifin, thus raising the float. Inthe particular application of this invention as a CG recorder and inconnection with boiler plants'requiring a recording chart of 20%,just ofthe movement of the float is lost motion, the extent of this lost motionbeing represented by the dotted line A. At this point the head of thefloat comes into contact with the end of the pivoted lever, or part 0 orabutment formed thereon or attached thereto, or an anti-friction bowl,the lever being actuated and the recorder pen traversed downward on thechart, the percentage of CO absorbed being indicated on the chart. Thesiphon then again discharges water from. the power vessel as describedand the water level in it and the burette rapidly falls to the normal.This not only insp1res a fresh sample of flue gas into the burette foranalysis, but also permits the float h to fall to its lowestlevel,forcing out the gas sample just tested down the pipe 9 within thefloat, and by way of the branch pipe 9 into the power vessel 6 fromwhich it can escape owing to the level of the water in the vessel beingthen below the discharge orifice of such pipe 9.

The instrument is to be adjusted on air which, containing no 00,, will 7all pass through the absorbing solution to the float causing this toperform its maximum travel, and the pen to travel right down the chartto the zero line at the bottom. In working, the CO is absorbed, causingthe float to travel less and the pen to stop short of its full traveland on a line indicating the exact percentage volume of C0 The .flow ofwater into the power vessel is arranged to be regulated by.a suitabletap or valve, and by such regulation any desired number of analyses tothe hour can be obtained, such analyses being recorded so long as wateris allowed to flow into the power vessel.

The separate glass tubes used in the appa- I ratus will be joined byrubber tubing.

To vfacilitate the emptying of the vessels and more particularly forportable models, short tubes not shown may be formed on the bottom ofthe float vessel and the connection from the power vessel to the gasburette. These tubes would be closed at the ends by pieces of rubbertubing and small screwclips. The clockwork can be inclined forward onthe knuckle joint 37 so that the drum can be removed and the chartchanged. At the same time the clock proper can be rewound by revolvingit by hand or by other device as known in these types of clocks.

I may find it desirable or necessary to float a certain volume of alight oil such as paraflin upon the surface of the water in the gasburette. The various vessels and tubes are made of glass, but anysuitable material may be used in their construction and the parts of theinstrument are inclosed in a suitable case, with glazed doors forinspection purposes and for a-flording access to the mechanism.

In order that the gas analyzed shall be of very recent manufacture, z.e. to reduce the time-lag of the instrument as much as possible, a formof aspirator or gas pump 'or similar contrivance may be used outsideassess? I corder inlet through which the required samples will be drawnby the action of the burette as described.

' The instrument may be used as a recorder for other gases than carbondi-oxid, the absorption vessel in such cases being filled with anappropriate chemical solution.

I declare that what I claim is.

1. In a gas analyzing and recording instrument a-gas burette, a powervessel connected directly by a branch to the gas burette and a siphonarranged with its in let end within the power vessel so as to constantlyleave a charge of water in the gas burette and power vessel below suchinlet end substantially as described.

2. In a gas analyzing and recording instrument, a gas burette formedwith a restricted waist, means to conduct the gas to the burette, apower vessel actuated by water head, and connected directly by a branchto the gas burette, means to conduct a fine stream of water to the-powervessel, and means to intermittently siphon ofi a portion only of thecontents of the gas burette and power vessel substantially as described.

3. In a gas analyzing and recording instrument, a gas burette, means foralternately inspiring and expelling gas samples into and out of suchburette, means to enable the gas burette to hold constantly a quantityof water charged with soluble gas, and an absorption vessel into whichthe whole of the gas sample is passed substantially as described.

4. A gas analyzing and recording instrument consisting-of a gas burette,a water power vessel, means governed by the with the absorption vesseland with the power vessel, a float in the float chamber, a pivoted leverone end of which is actuated by the float, a pen recording devicecarried on the other end of the pivoted lever, and a clockwork drum tocarry a chart on which the results of the analyses are recordedsubstantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

I WALTER, WILLIAM GROSWELLER. Witnesses:

JOSHUA EN'rwIsLE, ALFRED STUART Yarns.

